The 2026 (B.E. 2569) Ban Nong Nam Yen, Klaeng Flood: What Was Reported

According to Daily News on 3 October 2026, a new surge of water entered Ban Nong Nam Yen, Moo 11, Thung Khwai Kin subdistrict, Klaeng district, Rayong at around 22:00 on the night of 2 October. More than 80 people were evacuated to the Ban Khao Din shelter. Farmland including durian, rubber and mangosteen orchards, nearly 10,000 rai in total, was damaged, and water had been standing for more than a week. The causes were heavy rain and water from Khlong La-ok.

Nationally, the Department of Disaster Prevention and Mitigation (DDPM) reported, as of 06:00 on 7 October 2026, that 27 provinces plus Bangkok were affected, covering 123 districts, 984 subdistricts and 1,154,875 households, with more than 3.1 million people affected.

Klaeng is a farming district known for durian and mangosteen orchards and rubber plantations. Many homes are single-storey or raised houses among the orchards, using rural pour-flush latrines or septic tanks, and some still draw household water from shallow or deep wells. When water stands for a week, septic tanks and soak pits can overflow or be submerged, and waste can mix with the water that enters homes.

A Typical Scenario: The Orchard House Where the Toilet Smell Would Not Fade

Example case written to illustrate a common post-flood situation. It is not an interview with any resident of Ban Nong Nam Yen.

Noi and her husband run a small durian orchard in Klaeng. Their single-storey concrete house sits behind the orchard, with a bathroom at the back and a pour-flush latrine like most orchard homes. The night the water came, the family left for a shelter. They could not return for more than a week.

The first thing everyone noticed was the smell: a toilet-like stench mixed with rotten eggs drifting from the bathroom and the kitchen drain. A thin layer of black mud covered the floor, the lower walls showed a waterline, and the plywood kitchen cabinets had swollen and smelled musty. They shovelled mud, hosed the floors and poured toilet cleaner, but by evening the smell was rising from the drains and corners again.

A few days later their five-year-old daughter developed diarrhoea, with frequent loose stools, stomach pain and little appetite. Noi took her to hospital at once. The doctor asked about the family's drinking water. Noi realised the children had played on floors not yet disinfected, and that the family had been using water from a shallow well that the flood had covered.

The lesson: a sewage smell is not just unpleasant; it signals contamination. The right order is to care for the sick and see a doctor first, stop using a flooded well, call a septic service to check the tank, remove mud and disinfect surfaces, dry the house, and only then consider ozone in empty rooms to reduce lingering odour and airborne germs.

What Is E. coli?

Escherichia coli is a rod-shaped bacterium that normally lives in the intestines of people and warm-blooded animals. Most types are harmless, but because it is so abundant in faeces, water and health agencies worldwide use it as an indicator of faecal contamination. Finding E. coli in drinking water or on a surface means waste is present, and other gut germs may be too, such as diarrhoea viruses, Salmonella or Shigella.

Some E. coli types cause illness directly. Shiga toxin-producing E. coli (STEC), for example, can cause severe cramps, diarrhoea and sometimes bloody stools, and in some young children and older adults can lead to kidney complications needing hospital care.

How does E. coli spread?

The main route is faecal-oral: drinking contaminated water, eating contaminated food or food rinsed in unsafe water, touching mud, floodwater or soiled surfaces and then food or mouth, and young children putting hands or toys in their mouths. E. coli can persist for a time in mud and on damp surfaces, especially where air is still and nothing has been cleaned.

Why long-standing floodwater raises the risk

When water stands for a week, as in Thung Khwai Kin, it flows through latrines, septic tanks, animal pens and drains. Waste can be pushed up or dissolved into the water. When it recedes, it leaves mud that may hold faecal germs on floors, lower walls, under furniture, inside drains and in absorbent materials. Shallow wells covered by floodwater are also likely to be contaminated and should not be used for drinking or washing food until they are restored and the water is tested.

Where Do Sewage, Drain and Rotten-Egg Smells Come From?

People often search for why a house smells like a toilet after a flood, why drains smell, or why the bathroom smells of rotten eggs. Several causes usually act together.

• Overflowing septic tanks or soak pits: with groundwater high, the pit cannot drain and waste backs up through toilets and pipes
• Dry or mud-blocked traps: the water seal in the U-bend that blocks odour is lost or replaced by mud
• Hydrogen sulfide (rotten-egg gas): produced when organic matter breaks down without air in drain sludge, under-house water and septic tanks
• Mud and organic debris left in corners, under cabinets and beneath raised floors, still rotting while damp
• Absorbent contaminated materials: carpets, cushions, mattresses, plywood cabinets and gypsum ceilings that soaked up sewage
• Mold and bacteria in damp areas adding mustiness on top of the sewage smell

A very strong rotten-egg smell in an enclosed space such as a manhole, basement or large pipe may mean a high concentration of gas. Never enter alone; ventilate and call professionals. The smell that lingers in ordinary rooms after cleaning is the kind ozone can help with, once the source is fixed.

Symptoms After E. coli Exposure and Who Is Most at Risk

Illness from faecal contamination, whether from disease-causing E. coli or the germs that travel with it, usually starts within a few days.

• Diarrhoea with several loose stools a day
• Stomach pain, cramps or bloating
• Nausea and vomiting
• Low fever or tiredness
• Bloody stools in some cases, which needs a doctor right away

See a doctor promptly for bloody stools, severe diarrhoea or diarrhoea lasting more than two or three days, high fever, reduced or no urine, dry mouth or drowsiness, and for any young child, older adult or pregnant woman with diarrhoea. Meanwhile, sip oral rehydration solution often, and do not take anti-diarrhoea medicine without advice from a doctor or pharmacist. Anyone who waded through floodwater and develops high fever with calf pain should mention the flood exposure, as it may be leptospirosis.

Groups needing extra care

• Young children: play on floors, put hands in mouths and dehydrate quickly
• Older adults: weaker immunity and quicker dehydration
• Pregnant women
• People with kidney disease, diabetes or weak immunity
• Anyone cleaning bathrooms, floors and belongings
• Farmers returning to flooded durian, rubber and mangosteen orchards

E. coli and Sewage Odour Hotspots in Klaeng Homes

• Bathrooms, toilets and floor drains, where waste backs up and smells rise
• Kitchens, sinks and counters that were flooded and are used for food
• Floors and lower walls with a film of mud, especially grout lines and joints
• Under cabinets, beds and behind furniture, where mud dries slowly
• The space under raised houses, where water stands longest and mud goes septic
• Children's toys, shoes and garden tools that sat in floodwater
• Shallow wells, water tanks and jars that floodwater entered
• Fridges and flooded food, which should be discarded per health advice

CDC advises discarding food, drinking water and absorbent materials touched by floodwater. Hard surfaces should first be washed with clean water and soap or detergent, then disinfected with a suitable product following its label, while wearing rubber gloves, boots and a mask.

The Impact on Thung Khwai Kin Families

Health: diarrhoea in children and elders can dehydrate them quickly, and families with several sick members make repeated hospital trips while some roads are still flooded.

Money: septic pumping, pipe repairs, bottled water and disposal of damaged furniture, at the same time as orchard losses.

Time and work: farmers split their days between rescuing orchards and cleaning homes, and illness in the family halts orchard work.

Quality of life: a lingering sewage smell makes it hard to sleep or eat at home, and many families stay with relatives longer.

Why Washing, Pouring Cleaner or Air Freshener Does Not Remove the Smell

1. The source is still in the tank and pipes

If the septic tank is full or drains are clogged with mud, the smell returns whenever water is used. Call a pumping service, check pipes and refill every trap.

2. Disinfecting without washing first

Many disinfectants work poorly through mud and grime. Wash with clean water and detergent first, then disinfect per the label. Never mix bleach with toilet cleaners or ammonia, which can release dangerous gas.

3. Fragrance only masks

Air fresheners and incense help briefly but do not reduce odour molecules or germs at the source.

4. Keeping materials that absorbed sewage

Carpets, cushions, swollen plywood and gypsum boards that soaked up sewage keep releasing odour even when their surface looks dry. Remove and replace them.

5. Closing the house while damp

Humidity speeds rotting and mold growth. Ventilate and dry until the mustiness drops.

6. Forgetting the under-floor space

Raised orchard houses often hold water underneath longer than inside. Drain it, shovel out the mud and let sun and air in.

Ozone After the 2026 Klaeng, Rayong Flood with WHD: How It Helps with Odour and Germs

World Health Disinfection's residential ozone disinfection service uses ozone gas (O3), an oxidiser that breaks down the structure of viruses, bacteria, mold and odour molecules in the air and on surfaces the gas reaches. Ozone then reverts to oxygen (O2), leaving no chemical residue. According to the company's certification data, the service was tested by Thailand's Department of Medical Sciences and Intertek (UK) for eliminating viruses, bacteria and mold at 99.99%.

Those results apply to the virus, bacteria and mold groups under the company's test conditions. This article does not claim that ozone eliminates E. coli specifically. E. coli belongs to the bacteria group the service targets; for detailed test data, ask WHD directly.

Ozone's strength in sewage-flooded homes is odour. It reduces sewage, drain, damp and earthy smells lingering in the air and on surfaces of cleaned rooms, and reduces airborne germs, so rooms can be used again with confidence. It does not empty a full septic tank, repair pipes, make well water drinkable, replace washing and surface disinfection, or penetrate deep into materials that are still wet.

WHD's post-flood ozone process

1. Survey: by phone or LINE, the team reviews photos or video, size, room count, odour spots and dampness.
2. Fix the source, clean and dry first: pump or inspect the septic tank, flush drains, remove mud, wash with detergent then disinfect surfaces, remove sewage-soaked materials and ventilate until dry.
3. Empty the room: people, pets and plants out; food, medicine and sensitive items removed.
4. Seal and run: doors and windows closed, then the ozone cycle, typically about 30 minutes per zone depending on size and condition.
5. Rest and ventilate: ozone breaks down, then the room is aired for the time the technician sets.
6. Re-entry: once the technician confirms it is safe, with an odour check room by room.

Is Ozone Dangerous? Safety Rules

Ozone at disinfection levels is not safe to breathe, so treatment happens only in empty rooms, with time for breakdown and ventilation before anyone returns. Done correctly, the risk is very low.

• No people, pets or plants in the room during treatment
• Keep the room closed and do not open it mid-cycle
• Always remove mud, fix the odour source and dry the room first
• Ventilate for the time the technician sets before re-entry
• People with asthma or lung disease should wait until the room is fully aired
• Ozone does not replace a doctor for severe diarrhoea, bloody stools or fever

10 Reasons Klaeng Homes Should Consider Ozone After the 2026 Flood

1. Sewage odour is the hardest smell to live with: ozone for drain and toilet odours reduces what lingers after the source is fixed.
2. Fewer airborne germs in rooms that sewage entered, after cleaning and drying.
3. No chemical residue: ozone returns to oxygen, suiting homes with young children.
4. Reaches spots you cannot wipe: behind cabinets, under beds, up to the ceiling.
5. Certified testing: 99.99% for viruses, bacteria and mold, per the company's certification data.
6. Less mold spore load and mustiness once moldy materials are gone.
7. Short cycles: about 30 minutes per zone plus rest and ventilation.
8. Suits village shops and food stalls that must reopen without lingering smells.
9. Works for storerooms and tool sheds the flood left smelling, after cleaning.
10. Planning support from source repair to treatment day via the WHD ozone service.

Example Case: A Front-Room Grocery in an Orchard Village

Example case to illustrate the right order of work. Not a real customer review.

Daeng runs a small grocery in the front room of her Klaeng home. After more than a week of standing water, the shop and the bathroom behind it smelled strongly of sewage. Her son sent photos and video over LINE. The team advised calling a septic truck first, flushing drains, refilling traps, discarding flood-touched stock, removing swollen plywood shelves, washing floors with detergent then disinfecting, and running fans until dry.

When the space was ready, they booked ozone. Everyone left, including the dog and the potted plants by the door. The team sealed the area, ran each zone, then allowed breakdown and ventilation as advised.

The smell dropped enough for the shop to reopen. Ozone was the final step after the source was fixed, not a shortcut past septic pumping or cleaning.

Checklist: E. coli Prevention and Sewage Odour Removal After the 2026 Thung Khwai Kin Flood

Before entering

• Wear boots, rubber gloves, a mask and splash goggles
• Switch off power first; call an electrician if unsure
• Keep young children and elders away until cleaning is done
• Open doors and windows before starting

Water and food

• Drink bottled or boiled water; do not use a flooded shallow well until restored and tested
• Discard flood-touched food and fridge food after long power cuts
• Wash hands with soap before eating or cooking and after the toilet

Bathroom, drains and septic tank

• Call a septic service if toilets will not flush or smells back up
• Clear mud from floor drains and refill every trap
• Never enter a manhole or confined space alone

Surfaces and materials

• Wash hard surfaces with clean water and detergent, then disinfect per label
• Never mix bleach with ammonia or toilet cleaners
• Remove sewage-soaked carpets, cushions, mattresses, swollen plywood and gypsum
• Wash hard toys; discard soaked plush or foam toys

Ozone day and after

• Room dry, no mud or standing water, odour source fixed
• People, pets, plants, food and medicine out
• Re-enter when the technician confirms ventilation is complete
• Watch the family for diarrhoea and see a doctor for severe symptoms

FAQ: E. coli, Sewage Smell and Ozone in Klaeng, Rayong

What is E. coli and is it dangerous?

A gut bacterium in people and animals. Most types are harmless, but it signals faecal contamination, and some types cause severe or bloody diarrhoea.

What causes diarrhoea after a flood?

Usually germs from contaminated water, food or hands, such as some E. coli types, viruses or other sewage bacteria. Drink safe water, wash hands and see a doctor for severe symptoms.

My house smells like a toilet after the flood. What do I do?

Check the septic tank and drains, pump if needed, refill traps, remove mud and disinfect surfaces, remove sewage-soaked materials, dry the house, then use ozone for the remaining odour.

Why does the bathroom smell of rotten eggs after the water recedes?

Usually hydrogen sulfide from rotting organic matter in drains, septic tanks or trapped mud. If it is very strong in an enclosed space, ventilate and call professionals.

Can I drink well water after a flood?

Not until the well is restored and the water tested. Use bottled or boiled water meanwhile.

Does ozone remove drain and toilet smells?

It reduces odour molecules lingering in room air and on surfaces, but fix the source first or the smell returns.

Does ozone eliminate E. coli?

Per the company's certification data, WHD's ozone service eliminates the virus, bacteria and mold groups at 99.99%. E. coli is a bacterium, but this article makes no specific claim for it; ask WHD for test data. Surfaces still need washing and disinfecting first.

Is ozone dangerous? Can I stay home?

No one may stay in the room. It must be empty and closed, then aired as advised before re-entry.

How much does ozone treatment cost?

It depends on area, rooms, condition and distance. WHD quotes per job: 065-556-6294 or LINE @whd268.

Is there ozone service near me in Rayong or Klaeng?

WHD is based in Bang Khae, Bangkok 10160, with no Rayong branch. Call or LINE to discuss travel and scheduling; area and date are confirmed case by case, without a same-day promise.

Talk to WHD About Ozone Odour Removal After the 2026 Klaeng, Rayong Flood

If your home or shop in Thung Khwai Kin, Klaeng or nearby has had its odour source fixed, been cleaned and dried, yet still smells of sewage, drains or mustiness, the WHD team can assess the space and plan the steps.

See the Ozone Disinfection Service

Call 065-556-6294 | LINE @whd268

World Health Disinfection, Bang Khae, Bangkok 10160. Upcountry consultations by phone and LINE. Pricing by quotation. Promotion: free medical-grade disinfectant spray with ozone jobs of 15,000 baht or more.

Related Links and References

• WHD residential ozone disinfection
• WHD disinfection spraying service
• Daily News: Ban Nong Nam Yen, Thung Khwai Kin, Klaeng flood (3 Oct 2026)
• PRD: DDPM report as of 7 Oct 2026
• CDC: Floods and your health
• Department of Disease Control, Thailand
• WHO fact sheets

This article is general information, not medical diagnosis or treatment. See a doctor for any symptoms. Flood details follow the dates in the cited reports and change daily.